Furnace-eyesight



C. C. KELLEY. FURNACE EYESIGHTK APPLICATION FILED mAYs. 1920.

1,376,550. a en e May 3, 1921.

UNITED STATES PATENT OFFICEf COTT C. KELLEY, OF WORCESTER, MASSAGHUSETTS, ASSIGNOR TO AMERICAN DRESS LEE TUNNEL KILNS, ING, OF NEW YORK, N. Y., A CORPORATION OF NEN YORK.

FURNACE-EYESIGHT.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed May 6, 1920. Serial No. 379,312.

T 0 alllwhom it may concern Be it known that I, Co'r'r C. KELLEY, citizen of the United States, and resident of lVorcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Furnace-Eyesight, of which the following is a specification.

My present invention consists of an im proved furnace eyesight or inspection window through which the interior of a tunnel kiln or other furnace chamber may be visually inspected. The invention was devised with the object in view of providing a simple and effective construction for the purpose specified characterized by the ready manner in which the glass or other transparent window of the eyesight may be replaced without removing the window case from its seat in the furnace wall or subjecting the parts to stresses in the replacement operation tending to loosen the casing in the furnace wall.

The various features of novelty which characterize myinvention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however, and the advantages possessed by it reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described pre ferred embodiments of my invention.

Of the drawings:

Figure 1 is a sectional elevation of a portion of a furnace wall with one of my improved eyesights mounted therein;

Fig. 2 is a large sectional elevation of a portion of the eyesight;

Fig. 3 is an end view of the eyesight;

Fig. 4 is an elevation of a modified form of eyesight; and

Fig. 5 is an end view of the eyesight shown in Fig. 4:.

In the drawings, and referring first to the construction shown in Figs. 1, 2 and 3, A represents the wall of a furnace formed with an eyesight opening A. In the outer end of the eyesight opening A is inserted a tubular metallic part B which forms the easing or glass holder of the eyesight. The tubular part B will normally be inserted in the furnace wall a few inches and will be anchored in place by mortar G. The outer end of the part B which ordinarily projects outward from the furnace wall. a short distance, is formed with an outwardly pro jecting flange or head B. As shown the glass C, or window proper, of the eyesight extends across the bore of the part B and is held in place by a clamping plate D detachably connected to the head B, by screws E secured to the head B and passing through apertures formed for the purpose in the clamping plate D and wing nuts F threaded on the ends of the screws E. The clamping plate D is formed with a central aperture D registering with the bore of the part B. Advantageously, though not necessarily, the head B is formed with a recess B in its outerface of a depth approximately equal to the thickness of the glass C which is seated in this recess. The recess B is shown in Figs. 1, 2 and 3 as square, though it and the glass which ordinarily conforms in shape to the recess may be round or of other shape.

The cracking of the glass under the heat to which it is subjected or an impairment of its transparency under the conditions of use sometimes prevailing :make frequent glass replacements necessary. The metallic parts of furnace eyesights subjected to conditions tend to corrode or rust them, and considerable difliculty and annoyance has been experienced with the eyesight construction heretofore employed, in making glass replacements. The glass replacing operation with eyesight construction heretofore commonly employed have frequently result ed in loosening the eyesight casing in its mortar seat thus involving the res-eating of the window casing in the furnace wall. This takes time, of course, even when mortar is available as is not always the case, and furthermore may permit an objectionable influx of cold air into the furnace chamber during the period in which the winldow casing is being reset in the furnace wal With the described construction, the replacement of a glass C is a simple operation which may be easily and quickly performed. All that is required is the loosening of the wing nuts F to permit the clamping plate D to be moved away from the-head B far enough for the removal of the old glass and the insertion of a new glass, after which the nuts are again tightened to snugly hold the glass against its seat, The replacement may of the glass to loosen the latter in its seat in the furnace wall. In particular the nuts F may be loosened and tightened without putting any force on the part B tending to rotate the latter in its seat.

In the modified construction shown in Figs. 4: and 5, the metallic part BA differs from the part B of the construction first described in that the recess B for the window glass of CAis in the form of a shallow open ended groove, so that the glass CA may be, as shown in the formof a strip, the length of which is several times greater than the diameter of the bore of the part BA. With this form of m invention when the portion (3X in front of the passageway through the part BA cracks or becomes so coated as to impair its transparency, a perfeet portion of the glass strip CA may be brought into position by simply loosening the clamping screws F and sliding the glass lengthwise along the channel 13 after which the nuts are again tightened.

While, in accordance with the provisions of the statutes I have illustrated and described the best forms of my invention known to me it will be apparent to those skilled in the art that changes may be made in the .form of myinvention, as set forth in the appended claims without departing from the spirit of the invention.

Having 110W described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A furnace eyesight comprising a tubular part adapted to be anchored in a furnace wall, a glass at the outer end of said part extending across and closing the passage through said part, and means securing said glass to said part and adjustable to said clamping plate to said head comprising clamping screws extending parallel to the axis of saidpassage, but laterally displaced therefrom.

3'. A furnace eyesight comprising a tubular part adapted to be anchored in a furnace wall and provided at its outer end with an outwardly extending flange or head formed with a shallow groove open at its ends and adapted to receive a glass strip of sufiicient width to extend across and close the passageway through said part, said glass strip, and means for releasably clampin said strip in said groove.

Signed at l/Vorcester 1n the county of l/Vorcester and State of Massachusetts this 1st day of May, A. D. 1920.

GOTT C. KELLEY. 

